Gas burner



C. H. BUTZ GAS BURNER May 9, 1933.

Filed April 27, 1951 INVENTOR.

BY fMMa/ v ATTORNEYS.

:asey

Patented May 9, 1933 ,.UNITED 'STATES 57 J:einartnr:s H. BU'rz, `0F DENVER, CoLoRADo,-AssIGNoR rro THE nnNvEamanCLAY` PATENT orme;

COMPANY, or DENVER; COLORADO. i

` GAS BURNER `In other words, toretard the 'velocity to such xanextentA that itis within the limits ofthe frate of flame propagation ofthe gas.

YA further object isto providea nozzle of Y simple and practical construction that will icarrying out the foregoing objects.` Y 'Y Still otherobjectsreside in details-of con- `4struction and in novel Acombinations-and aru `rangements of parts, whichwill appear in n* the course of the following description..

In the drawing, like reference characters -des'ignate similar parts in theseveral views.

'Figure 1 is abroken plan of an embodi- W Imentzof my invention,'partly in section;

:Figure 2 is a section taken on the line 2-2 -ofFigure1- y .v

VFigure 3 isa section taken on the line 3-3 of Figure 1.v l

Figure' 4 is a broken, sectional view of 'a V'il"unio'difled construction.

fRei'erringmore in detailv to the drawing,

the reference character 5 designates athread- "edgas supply pipe connected with a source fof combustible gas. The tip ofthe pipe tap'ers,-as shown at 6, to provide a jet 7. A

" mixing chamber for the gas and air is gener- -ally designated by the numeral 8. The

*ichamberhas a restrictedthroat portion 9,

and flares outwardly at'l() and 11 at either e vside ofthethroat. Aispider 12 at the mouth l13ofvthe mixing chamber concentrically supports an internally threadedcollar 14, The supply pipe 5 is'screwed through this collar. A rotary shutter plate 15 is mounted upon the pipe 5.. In practice, theshutter is spaced F fromthe mouth 13 of the mixing chamber to admit air tothe mixing chamber. The shutter plate has lugs 16 for manipulation there- `f o .1

Screwed on a threaded end 17 of the flaring Appli'cation'i'ea A pril 27,

lightsv Y A There is a plurality of'such pilot-light pas-T .sages or, by-passes, which arefpreierably,v

portion 11 ofthe-mixing chamber arnoz-zle l 18. The nozzle (provides a conduit .comprising chambers 19 andy2v0 separated byl an enlargedinternalf rib 21 providing4 a restricted passagee therethrough; yThe rib has nonf parallelfaces 22 and 23. The face 22 issubstantially: at ,right angles y 'to-the interiorV of the 4chamber 19, and theface ,-23 converges toward the other face.. lip 25 projects over the face 23 and thereby provides a recessu:A

The Apilot-light passage, mentioned in the foregoing vobjects,preferably 'has two.V sec- `tions 26 and 27, the latter section being larger inv diameter. The passage tapers at 28 to .connectrthe two sections. The smallerfsectionis nearerthe chamber 19 and hencenearer the 4source of gas supply. The section 27 is ad- I jacent the burning chamber 20for the pilot thoughY not necessarily, at Aquadrant points, as shown in Figure-3. The passages converge toward'the axis ofthelchamher20. In

practice, these passages vare drilled at right angles to the face-23.*

The chamber 20 is deinedsb'y` the 21 andan inwardlycurveddiange 29, having a beveledvedge 30 substantially parallelgwith the axisof'the pilotlight passages.l The-.

edge is sofpositioned thatl drills for the passages/are allowed toV pass'byt'said edgeunhindered. is at 31.'

' Figure shows" a.. pilot-lightpassage 32* of somewhat different shape. In -this'modilied construction, the passage tapers from `a smaller port 33 in thechambery 19 to a larger port 34 in the chamber'20. Otherwise, `the construction' and arrangement of parts in theA `.The burning point of the nozzle modiiicationi are `substantially Vthe same as already described.

, In the use of the present pipe 5 is connected with a suitable source of gas supply. The air supply, tobe mixed with the gas supply," is vregulated by the ro'- invention, the

'tary shutter 15. The chamber 8, asl suggested heretofore, is'provided for mixing the air and gas. The shape of the chamber 8, which has been described he'reinbefore, produces a Venturi effect by the inrush of gas, thereby drawing in the air supply through the mouth 13.

When the mixed air and gas reach the chamber 19, the mixture is separated. By far the greater 'proportion of the `mixture f passes through the slightly restricted passage 24. The remainder of the mixture passes through the pilot-light passages. The 'enlarged sections of the passages provide means for retarding the velocity of the gas mixture traversing the passages. tarda-tion causes the velocity to be within the rate' of flame propagation.

The Vburning pointof each pilot-light is Vwithin the recess underv the lip 25, if the "pressure of gas in the burner isnlow, otherwise this pointris within the'chamber 20. lThe pressure coming through the pilot-light passages projects the'liame of the pilot-light intothe cha'mberQO and toward the main Vgas supply. The curved flange 29 and lip 25 .provide a `protected space therebetween.

for eddies of gas from the main supply. Gas in this chamber 2O is comparatively quiet, whichfurnishesy a supply for the pilot-lights to ignite, which in turn ignites the main supply when the flame'of the latter is extinguished. d It is believed clear Vthat the modification shown in Figure loperates in a similar manner. passage 32 is progressively retarded as the passage continuously enlarges. Otherwise the operation is as described.

Itlis to `be understood that changes Imay be made'in' the construction and arrange- `ment of the parts of the invention, without departing from the spirit and scope ofthe invention. What I Vcla-im and desire to secure by Letters Patent is:

l. 4A gas burner comprising a mixing chamber and a nozzle havi-ng a restricted pas- .sage provided with'alip projecting in the direction. of the travel of gas throughthe burner, the lip providing a recess thereunder, and an open-ended pilot-light by-pa'ss aroundthe restricted passage, having a protected outlet port in said recess.

" 2. A gas 'burner comprising a nozzle hav-Y ing a restrictedV conduit. a pilot light charnber beyond the restricted portion of the Vconduit in Vthe direction. of the travel of gas outlet connecting directly with the conduit at Vopposite sides of the'restriction, the outlet of the pilot light passage being appreciably larger" than its inlet, and the passage being progressively larger than the inlet to the outlet, permitting reduction of velocity and' expansion of the gases as they pass through vthe pilot light passage,` ksaid outlet empty- Y ing directly into said chamber.

This rey The velocity of the gas that enters the Y Vsaid chamber. v 6.A A'gas burner ingan internal rib providing a restriction through the burner, the burner having a pilot site sides of the restriction, the passage-hav-A light passage provided with an inletand an.

3. A. gas burner comprising'a nozzle having an internal rib, which, together with a wall of the nozzle, defines av pilot light chamber for the burner,a lip on the rib forming another wall for said chamber, the burner7 having a pilotlight passage, extending through Vthe rib and vhaving an outletin said chamber, said outlet being on the opposite side of the lip from the main Ysupply of gas passing through" the burner, whereby to vprotect a pilot light at said outlet.

A gas burner comprising a nozzle having an internal rib, which, together with a wall ofthe nozzle, Ydefines a pilot light chamber for the burner, a lip on the rib forming 5. burner1 comprising 'a nozzle havinga-restricted-conduit,"a pilot light chain-r ber beyon'dfthe restricted portion ofthe con--9 duit inthe direction of the travel ofV gas through the burner, the burner having a pilot `light passage v`provided with an inlet and an :outlet connecting directly with the conduit at" opposite sides of the restriction, the passageffcontinuouslytapering from' its inlet to :a

comparatively larger outlet, whereby vto per- Vmit reduction ofvelocity and expansionl of the gases asthey pass through the vpilot light passage, said outlet emptying directly intoA 'comprising a nozzle havwithinthe nozzle,a lip on the rib extending longitudinal of the burner in the y'direction ofi ,the flow of gas therethrough, the burner having a pilot light passage extendingthrough the rib, the outlet of the passage being behind'the lip withregard to the main flow of gas through the burnerand being set back]vl`1 from that end of the lip nearest the burning. point of the nozzle.v `f

` '.7. Av gas burner comprisinga nozzle havinga restricted-conduit,a vpilot light cham-I ber beyond the restricted portion of the con-1 duit inthe direction -ofV theitravel of vgas through the burner. the burner having a pilot light passage vprr'ivided with an inlet and an loutlet connecting with the conduit at oppoing successively larger sections from its inlet toits outlet, whereby to permit reduction of velocity and expansion of thev gases as they pass'through the'pilot light `pas'sage, said outlet emptying into said' chamber. 'l'

8. A burnerV according to claim 6, in which the pilot light passage is substantially at right angles to a surface'behindand set back from the end of the lip mentionedin y losY i Vsaid former claim, vsaidsurfac'e being at" '130 other than right angles to the axis of the burner.

9. A gas burner comprising a conduit providing a nozzle, and a pilot light passage having an outlet and an inlet connecting directly with the conduit, the passage by-passing a portion of the conduit, converging toward the axis of the conduit and having a larger outlet than inlet.

In testimony whereof I hereunto afx my signature.

CHARLES I-I.V BUTZ. 

